The world’s population is expanding and is estimated to reach 9.1 billion by 2050, necessitating a 70% increase in food production. Post-harvest losses (PHL), estimated at 20–60% of food products, exacerbate the food demand-supply gap, especially in developing countries. PHL is a key issue in worldwide farming, undermining efforts for better food access, poverty reduction, and sustainable development. PHL results in considerable losses in both food quantity and quality, affecting not only the ready accessibility of food for consumption but also the sustained financial health of farmers. Agricultural food processing has been recognized as a potentially practical approach to post-harvest loss (PHL), whereby direct agricultural products are modified to consumable processed goods, thereby adding value. This approach innovatively preserves spoilable food and, at the same time, develops product diversity. Also, beyond the reduced crop waste, it enables farmers, particularly smallholders, to access new markets and improve their earnings and well-being. Traditional preservation techniques like canning, pickling, freezing, fermenting, smoking, salting, and drying have long been used to reduce such losses. Drying, particularly solar drying, offers a sustainable, low-energy alternative vital for tropical and subtropical regions. Solar drying systems, cabinet, tunnel, and hybrid types have evolved by integrating solar collectors, such as parabolic troughs, dishes, and solar power towers. This chapter discusses the development of an Internet of Things (IoT)-assisted dual-supply solar food drying system, integrating a flat-plate collector and a parabolic dish, with IoT-based real-time monitoring and automated temperature control. Performance evaluation showed that the hybrid system (combined flat-plate and parabolic dish) achieved the highest drying efficiency. Moisture content of ash plantain (Musa paradisiaca) reduced from 72% to 15%, and Moringa (Moringa oleifera) leaves from 73% to 6% within 450 min, outperforming single-source systems by reducing drying time by 100 min compared to flat-plate and 50 min compared to dish systems. Traditional methods in Sri Lanka face issues of weather dependency, contamination, and inefficiency. The proposed system, leveraging dual solar sources and IoT, ensures improved drying quality, energy efficiency, and reduced spoilage risks, offering a scalable solution for sustainable food preservation. The architecture combines solar concentration techniques with flat-plate heating, Arduino-based temperature control, and real-time data monitoring, providing a reliable method to enhance food security while minimizing environmental impacts.